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Quantitative Aptitude
Triangle
Triangle ABC has AB = 10, AC = 8, angle A = 60°. Find BC.

Question

Triangle ABC has AB = 10, AC = 8, angle A = 60°. Find

BC.

A 2√17 Correct Answer Incorrect Answer

B 2√21 Correct Answer Incorrect Answer

C 3√23 Correct Answer Incorrect Answer

D 2√19 Correct Answer Incorrect Answer

Solution

ATQ, BC² = 10² + 8² – 2×10×8×cos60 = 100 + 64 – 80 = 84 BC = sqrt(84) = 2√21

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